What is a corrugated duct pipe used for in post-tensioning?

A corrugated duct pipe provides the void form for strand installation and develops the bond between the strand and the concrete in a post-tensioning system. Ducts are specified for bridges, buildings and segmental construction, and the corrugated profile gives the duct excellent concrete bond once the concrete is cast around it. The internal profile is smooth for grouting, and the connections are made leak-tight so the void stays clean and ready for the strand.

What types and diameters of corrugated duct do you supply?

Duct is available in steel or HDPE with a diameter range of 50 mm to 150 mm, supplied in custom cut lengths. Corrosion protection is either galvanized for steel duct or full plastic for HDPE duct, and duct can be produced to FIB, EN or AASHTO requirements depending on the project specification. State the duct type, diameter, corrosion protection and required cut length so the offer matches your tendon layout.

What should I include in a corrugated duct inquiry?

Send the duct type (steel or HDPE), diameter, wall type, corrosion protection (galvanized or full plastic), the standard the project follows (FIB, EN or AASHTO), the required cut lengths, quantity, packing method and destination port. If the duct belongs to a larger post-tensioning package, also list the anchorage, wedge and strand details and attach the relevant drawings so the duct can be matched to the tendon geometry.

Steel / HDPE 50 - 150 mm FIB · EN · AASHTO Galvanized / Full plastic

Corrugated Duct Pipe for Post Tension System

Name: Corrugated Duct Pipe for Post Tension System
Brand: Global Overseas

Others

Galvanized and Plastic Corrugated Duct

Corrugated steel and HDPE ducts for post-tensioning systems. Provide the void form for strand installation and bond development between strand and concrete.

Technical specification of corrugated duct pipe for post tension systems
Type	Steel / HDPE
Diameter Range	50 - 150 mm
Length	Custom cut lengths
Standard	FIB, EN, AASHTO
Corrosion Protection	Galvanized / Full plastic
Application	Bridges, buildings, segmental

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Key features

Why projects specify these ducts

Four properties that decide how the tendon void behaves before, during and after grouting.

01

Smooth internal profile for grouting

The internal profile lets grout move freely along the duct once the strand is installed, so the void form stays workable through the grouting stage.

02

Excellent concrete bond

The corrugated profile develops bond between duct and concrete, which is what carries the strand-concrete action in bridges, buildings and segmental construction.

03

Available in metal and plastic

Supplied as steel duct with galvanized protection or HDPE duct with full plastic protection, in diameters from 50 mm to 150 mm to FIB, EN or AASHTO requirements.

04

Leak-tight connections

Duct sections join with leak-tight connections and are cut to the lengths your tendon layout requires, keeping the void form intact for strand installation.

Technical answer

What is a corrugated duct pipe for post tension systems?

Definition

A corrugated duct pipe is the void former that a post-tensioning tendon is installed into before grouting. Global Overseas supplies steel and HDPE ducts in diameters from 50 mm to 150 mm, cut to the lengths your drawings require, in galvanized or full plastic corrosion protection. The duct creates the void for strand installation and develops the bond between the strand and the surrounding concrete, so the tendon works as part of the finished structure.

Typical applications are bridges, buildings and segmental construction, where ducts are supplied to FIB, EN or AASHTO requirements depending on the project specification. Steel duct is chosen where a stiffer void former is needed; HDPE duct is used where a fully plastic, corrosion-protected system is specified. Because ducts are made to order in custom cut lengths, the duct diameter, wall type, corrosion protection, connection detail and required length should be stated in the inquiry together with the quantity and destination port.

Specification

What to state in the RFQ

Duct type (steel or HDPE), diameter 50–150 mm, wall type, corrosion protection (galvanized or full plastic), standard (FIB, EN or AASHTO), custom cut lengths, quantity, packing method, destination port and any inspection requirement.

Compatibility

Confirm the tendon geometry, strand diameter and anchorage detail before ordering. Duct selection must follow the project engineer’s drawings and the anchorage supplier’s compatibility requirements.

Anchorage wedges

Accessories supplied for the same tendon system as the corrugated duct.